A classic guitar
Classification String instrument (plucked, nylon-stringed guitars usually played with fingerpicking, and steel-, etc. usually with a pick.)
Hornbostel-Sachs classification 321.322
(a regularly tuned guitar)
Bowed and plucked string instruments
The guitar is a musical instrument with ancient roots that adapts readily to a wide variety of musical styles. It typically has six strings, but four-, seven-, eight-, ten-, eleven-, twelve-, thirteen- and eighteen-string guitars also exist. The size and shape of the neck and the base of the guitar also vary, producing a variety of sounds. The two main types of guitars are the electric guitar and the acoustic guitar (of which the three main types are the classical guitar, the steel-string flattop guitar, and the archtop guitar).
Guitars are recognized as one of the primary instruments in flamenco, jazz, blues, country, mariachi, rock music, and many forms of pop. They can also be a solo classical instrument. Guitars may be played acoustically, where the tone is produced by vibration of the strings and modulated by the hollow body, or they may rely on an amplifier that can electronically manipulate tone. Such electric guitars were introduced in the 1930s, and they have continued to have a profound influence on popular culture since then.
Traditionally guitars have been constructed of various woods and strung with animal gut, or more recently, with either nylon or steel strings. Guitars are made and repaired by luthiers